This patch unifies the Backend module registration for Extbase modules
like it has already been done for all other Backend modules using PSR-7
entry-points. This way backend route dispatching and module registration
has been simplified.

The entrypoint for Extbase Backend modules is now
\TYPO3\CMS\Extbase\Core\Bootstrap->handleBackendRequest()
which returns a PSR-7 response object.

The following functionality has been marked as deprecated as it was
solely built to handle Extbase modules when conf.php and index.php were
still in style:

ExtensionManagementUtility::configureModule()
$GLOBALS['TBE_MODULES']['_configuration'][$name]['configureModuleFunction']

Releases: master
Resolves: #82902
Related: #58621
Change-Id: I7956b350d650ed52bc7b5d83db20df386d79eb65
Reviewed-on: https://review.typo3.org/54531


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Henning Liebe <h.liebe@neusta.de>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>